Multi Site Chain of Custody Credit Ledger Fundamentals
Multi-site chain of custody credit ledgers centralize certified fiber allocations across eligible sites under strict conversion and 24-month expiration limits.
Non Fiber Deduction
Contaminant Adjustment
Commercial weight adjustments in recovered paper trading account for non-cellulosic impurities present in delivered scrap paper shipments. Non fiber deduction reduces payable bale weight based on the mass fraction of plastics, metals, glass, dirt and moisture excess found during core sampling or bale breaking. Paper recycling mills set strict purity thresholds to prevent pulper damage and maintain finished paperboard quality.
Contractual agreements establish standard allowable contamination limits, above which financial deductions or shipment rejections take effect. The protocol applies to recovered paper grades under EN 643 and ISRI scrap specifications.
Commercial Rejection
Mill receiving inspection departments conduct core drilling and manual sorting of sample bales to isolate non-paper elements. High percentages of plastic film, wire, metal fasteners and outthrow materials clog pulper extraction plates and damage high-density cleaners. Quantifying non-cellulosic mass enables receiving clerks to calculate a precise non fiber deduction, reducing invoice payment according to verified net usable fiber content.
Excessive non-paper content increases mill landfill disposal costs and elevates energy requirements during mechanical contaminants separation. Consistent deduction practices incentivize waste collectors to improve sorting efficiency at material recovery facilities.
Scale Limitation
Deduction protocols apply strictly at the raw material receiving stage prior to pulper dumping. Contaminant mass calculations exclude process additives added downstream during stock preparation and papermaking.